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						<h1 id="firstHeading" class="firstHeading" lang="en"><span dir="auto">Alpha channel</span></h1>
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								<div id="siteSub">From PanoTools.org Wiki</div>
								
												
				<div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><p>an image channel containing a mask or selection.
An <b>Alpha channel</b> is an additional image channel just like the red, green or blue channel. It can contain any information in form of a grayscale image but commonly it is used to store a selection or a mask. 
</p>
<ul>
<li> Black alpha channel pixels usually stand for masked, invisible or unselected pixels in the main image. 
</li>
<li> White alpha channel pixels stand for unmasked, visible or selected pixels. 
</li>
<li> Gray alpha channel pixels stand for more or less translucent pixels according to the brightness of gray.
</li>
</ul>
<p>Both <a href="Enblend.html" title="Enblend">enblend</a> and smartblend<a class="external" href="http://wiki.panotools.org/Smartblend">[*]</a> use the alpha channel to determine seam position when blending,
see the how to use enblend for patching zenith and nadir images<a class="external" href="http://wiki.panotools.org/How_to_use_enblend_for_patching_zenith_and_nadir_images">[*]</a> tutorial for details.
</p><p>More information on wikipedia:alpha channel<a class="external" href="http://www.wikipedia.org/wiki/alpha_channel">[*]</a> page
</p>



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